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Absorption length for photon propagation in highly dense colloidal dispersions

Published online by Cambridge University Press:  31 January 2011

Rajeev Garg ,
Robert K. Prud'homme ,
Ilhan A. Aksay ,
Feng Liu  and
Robert R. Alfano
Rajeev Garg
Affiliation:
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,Princeton, New Jersey 08544–5263
Robert K. Prud'homme
Affiliation:
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,Princeton, New Jersey 08544–5263
Ilhan A. Aksay
Affiliation:
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,Princeton, New Jersey 08544–5263
Feng Liu
Affiliation:
Department of Physics and Electrical Engineering, Institute for Ultrafast Spectroscopy and Lasers, New York State, Center of Advanced Technology for Ultrafast Photonic Materials and Applications, The City College and the Graduate Center of the City University of New York, New York, New York 10031
Robert R. Alfano
Affiliation:
Department of Physics and Electrical Engineering, Institute for Ultrafast Spectroscopy and Lasers, New York State, Center of Advanced Technology for Ultrafast Photonic Materials and Applications, The City College and the Graduate Center of the City University of New York, New York, New York 10031
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Abstract

The absorption length for photon propagation in highly concentrated colloidal dispersions calculated from temporal intensity profiles of 100 femto-second pulses is much longer than the absorption length obtained from the measurements of static light transmission in the pure continuous phase fluid. The difference between these two values is explained on the basis of small interparticle spacing at high particle concentration and hence shorter paths traveled by photons through the absorbing medium relative to the total diffusive path in the dispersion. The two values are in good agreement when the absorption length is rescaled with the interparticle separation.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 12 , December 1998 , pp. 3463 - 3467
Copyright
Copyright © Materials Research Society 1998

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